add /img/n/m endpoint to skiaserve

tools/skiaserve/Request.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Request.h"
 
 #include "png.h"
@@ skipping 75 matching lines @@
 SkCanvas* Request::getCanvas() {
     GrContextFactory* factory = fContextFactory;
     SkGLContext* gl = factory->getContextInfo(GrContextFactory::kNative_GLContextType,
                                               GrContextFactory::kNone_GLContextOptions).fGLContext;
     gl->makeCurrent();
     SkASSERT(fDebugCanvas);
     SkCanvas* target = fSurface->getCanvas();
     return target;
 }
 
-void Request::drawToCanvas(int n) {
+void Request::drawToCanvas(int n, int m) {
     SkCanvas* target = this->getCanvas();
-    fDebugCanvas->drawTo(target, n);
+    fDebugCanvas->drawTo(target, n, m);
 }
 
-SkData* Request::drawToPng(int n) {
-    this->drawToCanvas(n);
+SkData* Request::drawToPng(int n, int m) {
+    this->drawToCanvas(n, m);
     return writeCanvasToPng(this->getCanvas());
 }
 
 SkSurface* Request::createCPUSurface() {
     SkImageInfo info = SkImageInfo::Make(kImageWidth, kImageHeight, kN32_SkColorType,
                                          kPremul_SkAlphaType);
     return SkSurface::NewRaster(info);
 }
 
 SkSurface* Request::createGPUSurface() {
@@ skipping 116 matching lines @@
     SkIRect clip = fDebugCanvas->getCurrentClip();
     Json::Value info(Json::objectValue);
     info["ViewMatrix"] = SkJSONCanvas::MakeMatrix(vm);
     info["ClipRect"] = SkJSONCanvas::MakeIRect(clip);
 
     std::string json = Json::FastWriter().write(info);
 
     // We don't want the null terminator so strlen is correct
     return SkData::NewWithCopy(json.c_str(), strlen(json.c_str()));
 }